FI92232C - Plant for removing dammed water and the blade of a scraper in a paper machine - Google Patents

Description

92232

Apparatus for removing potted water and pulp from the scraper blade of a scraper in a paper machine Anlåggning for att avlågsna uppdammat watten och skavarbladet av en skavare i en pappersmaskin 5

The invention relates to an apparatus for removing potted water and pulp from a scraper blade of a scraper in a paper machine.

10

When placing a new double scraper structure in connection with the upper roll of a separate press in the machine machine rebuilds, there are situations in which the blade above the double scraper is in a position where the back surface of the scraper blade is rising. Since the scraper blade in connection with the upper roll is water-lubricated, the said position then causes a disadvantage when the pulp and water are trapped on the scraper blade.

This application presents a solution to the above problem. According to the invention, the scraper in the paper machine is provided with a suction device which absorbs all the water and pulp trapped in the scraper blade. The suction device 20 according to the invention comprises suction nozzles which are connected to the suction pipe through a flexible one. The suction nozzles are fitted on both sides of the scraper blade outside the width range of the paper web. In this way, the nozzles are also not a disadvantage in paper machine line break situations where the paper web travels with the top roll to the scraper. The suction nozzles are connected by a flexible connection, preferably a hose, to the suction pipe. The nozzles of the container 25 can be moved out of the way in connection with roller changes without the need to remove the suction device separately. The nozzle is arranged a few millimeters away from the scraper blade, so that the nozzle does not cause a harmful load on the scraper blade. The suction gap of the nozzle is at an angle to the cylinder surface of the nozzle and at an oblique angle to the central axis of the nozzle. In this case, a circular flow is provided through the suction gap of the nozzle, which prevents the nozzle and the suction piping from clogging.

2,92232

The apparatus according to the invention is mainly characterized in that a suction device is arranged in connection with the scraper blade in order to remove the dammed water and the pulp from the upper surface of the scraper blade, comprising at least one suction nozzle through which the water trapped on the upper surface of the scraper blade is sucked out.

5

The invention will now be described with reference to some preferred embodiments of the invention shown in the figures of the accompanying drawings, to which, however, the invention is not intended to be exclusively limited.

Figure 1 shows a device according to the invention in position in connection with the upper roll of a quad press.

Figure 2 shows a device according to the invention seen from the machine direction.

3 shows the direction of arrow 15 in FIG device of Figure 2 seen from the direction K i.

Figure 4A shows the suction nozzle of the suction device separately.

Figure 4B shows a suction nozzle of the suction device of Figure 4A from the direction of the arrow 20 as seen K2.

Figure 1 shows a double scraper 10 in connection with the press section of a paper machine. The scraper 10 encapsulates the scraper blades 12a, 12b attached to the scraper body 11, of which the upper surface of the scraper blade 12a is inclined obliquely to the horizontal. Water is sprayed through the spray pipe 13 25, as shown by the arrows S, on the surface of the upper roll T of the press to lubricate the blades 12a, 12b. Since the upper surface of the first scraper blade 12a is rising with respect to the direction of rotation of the roll T, the sprayed water tends to be trapped on the upper surface of the scraper blade 12a. The second upper surface of the scraper blade 12b is obliquely sloping, so that water and paper pulp do not drip onto said scraper blade 12b.

11 30 3 92232

As shown in Fig. 1, a suction device 14 is arranged in connection with the scraper blade 12a of the scraper 10, through the suction nozzles 15 of which water and paper pulp trapped on the scraper blade 12a are sucked from both sides of the scraper blade 12a.

Figure 2 shows the suction device 14 according to the invention in more detail. The suction device 14 comprises at least one suction nozzle 15 connected to a flexible joint 16. In the dry embodiment 2 of the invention, a suction nozzle 15a, 15b is arranged on both sides of a scraper blade 12a connected to the upper roll T, the nozzles 15a, 15b preferably connected to a flexible joint 16a, 16b. . The connections 16a, 16b are further connected 10 to the suction pipe 17. The suction pipe 17 is subjected to a suction by means of a pump device 18 when the valve 19 adjusts the suction pressure in the suction nozzles 15a, 15b and thus the suction intensity.

The suction tube 17 is supported by support rods 20a, 20b on the support arm 21. Due to the hose between the suction tube and the nozzle 15, the nozzles do not cause any inconvenience during scraper blade replacement or other repairs, as the nozzles can be turned to the side thanks to the hose.

The suction nozzles 15 are arranged from the central axis X of the actual nozzle portion 150 parallel to the longitudinal axis X 'of the scraper blade 12. Through the suction nozzles 15a, 15b, suction is applied to the entire surface above the scraper blade 12a over the entire distance of the scraper blade 12a.

The suction nozzles 15a, 15b are arranged in the edge areas at and a2 of the scraper blade 12a and outside the width dimension L of the paper. Thus, in situations where the paper web is broken and the paper may be taken away by the center roll T, the paper web does not come into interfering contact with the suction nozzles 15a, 15b. Thus, the suction nozzles 15a, 15b located at the edges of the scraper blade 12a do not cause disturbance, e.g. in the path of a paper web break. The suction nozzles 15a, 15b are arranged at a distance f from the upper surface of the scraper blade 12a. The spacing f is 1-2 mm. In this case, the suction nozzles 15a, 15b do not load the scraper blade 12a.

• 4,92232

Figure 3 shows the apparatus seen from the direction Kt of Figure 2. Roller T is shown in a partial view. The suction nozzle 15a, 15b is placed at a distance f upwards from the upper surface 12a 'of the scraper blade 12a which is inclined upwards. The distance f is preferably 1-2 mm.

5

As shown by the arrows S, a water jet is sprayed through the spray pipe 13 onto the upper surface T 'of the central roll T, and the central roll takes the water jet as it goes and lubricates the scraper blades 12a, 12b, which are connected to the roll surface Τ'. The water trapped on the upper surface 12a 'of the scraper blade 12a and the pulp are sucked out through the suction nozzles 15a, 15b of the suction device 14, the suction flow 10 being led to the flexible connection 16a, 16b and further to the suction pipe 17. The suction is effected by

Figure 4A shows a preferred embodiment of the suction nozzle 15 of the suction device 14. The suction nozzle 15 comprises an actual nozzle portion 150 and an associated nozzle portion having a stem portion 151 at a substantially 90 ° angle to the central axis X. The stem portion 151 is associated with a flexible hose 16. When the nozzle 15 is suspended from the hose 16, the actual nozzle portion 150 is substantially . The suction nozzle 15 covers a suction gap 22 made on the jacket surface 15 'of the cylindrical nozzle 15. The width e of the suction gap 22 is about 5 mm and the suction gap is arranged to run at an oblique angle α to the longitudinal axis X of the nozzle, the angle α being preferably about 15 °. Said arrangement provides a suction flow for a porous advancing movement and prevents clogging of the suction nozzle 15 and the suction gap 22. The suction nozzle 15 feeds the end plate 15 ". The suction flow is directed inside the nozzle 15 only through a suction gap 22 made on the cylindrical surface 15 'of the nozzle 15.

Figure 4B shows the Figure 4A, the nozzle of Figure 4A viewed in the direction of the arrow K2. The diameter D of the nozzle is preferably about 34 mm.

iT

Claims (8)

92232 An apparatus for removing potted water and pulp from a scraper scraper blade in a paper machine, in particular a water-lubricated scraper blade (12a) arranged in connection with a press roll (T) of a paper machine press, the scraper blade (12a) above the scraper blade (12a ') being inclined horizontally and paper pulp by suction, characterized in that a suction device (14) is arranged in connection with the scraper blade (12a) for removing potted water and paper pulp from the upper surface of the scraper blade (12a), comprising at least one suction nozzle (IS) through which 10 scraper blades (12a) are sucked. 12a ') dammed water and pulp away. Apparatus according to claim 1, characterized in that the suction nozzle (15) is placed at a distance from the upper surface (12a ') of the scraper blade (12a) and connected to a flexible joint (16), the suction flow being led from the nozzle (15) through a flexible joint 15 (16) off. Apparatus according to claim 1 or 2, characterized in that the first suction nozzle (15a) is arranged on one end (aj) of the scraper blade (12a) and the second suction nozzle (15b) is arranged on the other end (a2) of the scraper blade (12a) and that the suction nozzles (15a, 15b) are arranged on the upper surface (12a ') of the suction scraper blade (12a). water and pulp away from the top surface of the scraper blade through the side areas (a}, a2) of the scraper blade. Apparatus according to one of the preceding claims 1 to 3, characterized in that the first suction nozzle (15a) is connected to the connection (16a) and the second suction nozzle (15b) is connected to the connection (16b) and that the connections (16a, 16b) are flexible and connected to a suction pipe (17) to which a suction pipe (17) is connected to a pump device (18) by means of which a vacuum is provided in the suction piping (17, 16a, 16b, 15a, 15b). Apparatus according to the preceding claim, characterized in that a valve (19) is connected to the suction piping, the throttle of which is regulated by adjusting the suction pressure in the suction nozzle (15a, 15b) and thus the suction power. 92232 Apparatus according to one of the preceding claims, characterized in that the suction nozzles (15) are arranged on the central axis (X) of the actual nozzle section (150) parallel to the longitudinal axis (X ') of the scraper blade (12) and at a distance (f), preferably 1-2 mm: n to the distance area from the upper surface (12a ') of the scraper blade (12a). 5 Apparatus according to one of the preceding claims, characterized in that the suction nozzles (15a, 15b) are arranged on the edge regions (aj) of the scraper blade (12a) in such a way that they are outside the web width range with respect to the paper web width (L). when the paper web comes into contact with the roll surface (Τ '), the suction nozzles (15a, 15b) do not interfere with the passage of the paper web. Apparatus according to any one of the preceding claims, characterized in that the suction nozzle (15) comprises an actual nozzle portion (150) and an associated stem portion (151), the stem portion (151) being located approximately perpendicular to the actual nozzle portion (150). Apparatus according to one of the preceding claims, characterized in that the suction nozzle (15) comprises in the actual nozzle section (150) on its cylindrical surface (15 ') a suction gap (22) made on the jacket surface (15') so that it runs obliquely at an angle ( a) preferably at an angle of about 15 ° to the longitudinal axis (X) of the nozzle portion (150), whereby the suction flow is made to rotate forward in a circular manner so as to effectively prevent clogging of the suction nozzles (15), their suction slots (22) and suction pipes. 92232